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. A methodology useful for calculating the frequency response functions in terms of interface forces and local accelerations of a hard-mounted structure subjected to base-shake sine tests is described in this work. The structure is specifically a SC and will be called SC01. Reference to basic structural dynamics is done. The proposed easy-to-implement procedure permits to calculate the SC interface forces to the base and the SC local accelerations by post treating the results of the hard-mounted normal mode analysis. As a consequence of that, dedicated frequency response runs are not necessary. In accordance with the mode superposition approach, the normal mode analysis outputs are processed by accounting each modal contribution independently from the others. The relevance of each mode on the SC responses is thus explicitly quantified. This can favour a focused design refinement aiming to produce the main impact on the natural frequencies and mode shapes of interest. The critical responses can thus be modified and this can produce some advantages along the preliminary definition of the sine test notching plan. A complete set of numerical result comparisons is detailed along the paper in order to assess the accuracy of the methodology presented.

AN EASY-TO-IMPLEMENT COMPUTATIONAL METHOD FOR THE SPACECRAFT SINE TEST-PREDICTION WITH PARTICULAR EMPHASIS ON THE MODAL CONTRIBUTIONS